[Toybox] [PATCH] New command: flock

[enh]

New command: flock.

The brillo folks wanted this in a shell script they're porting over
(so I've only implemented the fd style they wanted, not the named file
style).

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.
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